satellite c600 memory upgrade
After adding second 4g ram card, windows 7 fails to start up. Should I have changed any bios data or other parameters.
The Satellite C660 series offers efficient processing, high storage capacity and a DVD Super Multi Drive for watching DVDs. A 39.6cm (15.6“) Toshiba TruBrite® HD widescreen with LED backlighting.
The most likely reason is because the laptop is not compatible with the new memory or both RAMs can't work together.
In order to diagnose the problem, try to boot the laptop with just the new memory plugged in. If the laptop boots, then the trouble is that the old and the new memory don't get along. If the laptop doesn't boot, then is just that the new memory is not compatible with your laptop (because of the FSB or something).
The easiest way to avoid these kind of problems in RAM upgrades is buying exactly the same type of RAM that the one you have already working (the sticker attached to the memory will give you the parameters needed).
Far as I recall the 660 states it supports up to 8Gb Ram. I placed an extra 4Gb in mine bringing it up to 6 and it works fine. Perhaps swapping the modules around or try running laptop with just the new RAM first. mind you I imagine you would most likely have tried this already.
Failing which, it is entirely possible you may have a dud Dimm. Updating the bios which hasn't been changed for ages cos the 660 is an old model may or may not make a difference depending on how old your current bios is. As a footnote to this, always read what bios improvements/changes are listed in the readme accompanying the bios. So don't update the bios for the sake of it as although bioses and the procedure to update them are far more stable today than they ever have been you can still screw things up if you don't know what you are doing.
Luckily, so far I've never messed up a bios in the 25 years of working with PC's but it can happen to the best of us.
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